On Wed, Sep 27, 2017 at 04:35:00PM -0500, Dennis Zhou wrote: > The iterator functions pcpu_next_md_free_region and > pcpu_next_fit_region use the block offset to determine if they have > checked the area in the prior iteration. However, this causes an issue > when the block offset is greater than subsequent block contig hints. If > within the iterator it moves to check subsequent blocks, it may fail in > the second predicate due to the block offset not being cleared. Thus, > this causes the allocator to skip over blocks leading to false failures > when allocating from the reserved chunk. While this happens in the > general case as well, it will only fail if it cannot allocate a new > chunk. > > This patch resets the block offset to 0 to pass the second predicate > when checking subseqent blocks within the iterator function. > > Signed-off-by: Dennis Zhou <dennisszhou@xxxxxxxxx> > Reported-by: Luis Henriques <lhenriques@xxxxxxxx> Applied to percpu/for-4.14-fixes. Thanks! -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
